grid vs. cloud computing

https://en.m.wikipedia.org/wiki/Off-the-grid

https://en.m.wikipedia.org/wiki/Grid_computing

https://en.m.wikipedia.org/wiki/Cloud_computing

http://stackoverflow.com/questions/1067987/what-is-the-difference-between-cloud-computing-and-grid-computing

http://www.ibm.com/developerworks/library/wa-cloudgrid/

http://scientific-journals.org/journalofsystemsandsoftware/archive/vol2no5/vol2no5_4.pdf